Substituted bis-triazinylamino stilbene compounds and compositions thereof



United States Patent 2 Claims ABSTRACT OF THE DISCLOSURE The invention relates to novel triazinyl stilbene optical brightening agents of the formula:

wherein 2 has a value of 0-1, and X and Y each independently are:

and a has a value of 1-3, b has a value of O-l, c has a value of 0-1, d has a value of 0-1; or X and Y taken together may form a morpholino ring. These compounds maintain their brightening effect on fabrics which are treated with cationic softeners either after, or concurrently, with the application of the brightener agent.

This invention relates to optical brightening agents and to compositions containing these new brightening agents.

The new compounds of this invention are optical brighteners of the bis-triazinylarnino stilbene type. This class of compounds is finding rapidly increasing application in the textile, paper, detergent and other laundry product industries. The increased brightness which results from incorporating relatively minor amounts of such brighteners into paper, textiles, detergents and other 1aun-. dry products greatly enhances the appearance and consequently, the marketable value of the finished products.

Optical brighteners improve the appearance of these products by neutralizing the familiar yellow tinge that is usually apparent in untreated products of the type mentioned. This yellow tinge is caused by the absorption of short wavelength light. Optical brighteners neutralize the yellow tinge resulting therefrom by absorbing invisible ultraviolet radiation and emitting the energy thereof in the form of visible blue to blue-violet light. The fluorescent properties of the optical brighteners of this invention are strikingly apparent under ultraviolet light in darkroom conditions.

One area in which the full benefit of previously available optical brighteners has not been obtainable is in the treatment of textile fabrics, either during mill manufacturing operations or in laundries, where fabric softeners have been applied to the fabrics.

Whether the fabric softener is applied in the mill, after,

or during the application of the brightener, or as a part.

of the finish cycle during laundering, i.e., after washing, the use of softeners has had a masking or quenching effect on the brighteners of the prior art.

3,546,218 Patented Dec. 8, 1970 This quenching effect is noted by the decrease in bright-. ener fluorescence caused by a cationic softener. Thus, for example, a fabric washed in detergent containing prior art optical brighteners will achieve a certain fluorescence level. However, if the washed fabric is then treated with a cationic softener the fluorescence level will drop so much that practically the entire brightening affect is lost; even though no brightener is removed from the fabric during the application of the softener.

Thus the housewife may launder her family clothes with a relatively expensive detergent in order to achieve a brighter wash by virtue of the optical brightener contained in the detergent, and then in finishing the wash by the routine use of a cationic fabric softener, almost completely destroy the bright-White affect of the brightener for which she paid a premium price in purchasing her detergent.

The new optical brightening agents which I have discovered, besides being very useful for the usual applications of optical brighteners, surprisingly maintain their brightening affect on fabrics which are treated with cationic softeners either after, or concurrently, with the application of the brightener agent.

The new optical brightener compounds I have discovered have the following formula:

wherein 2 has a value of 0-1 and X and Y each independently are;

and a has a value of 1-3, b has a value of 0-1, 0 has a value of 0-1, d has a value of O-l; or X and Y taken together may form a morpholino ring.

The alkaline salts of the compound of the above formula are also encompassed Within the scope of the invention. Typical basic cations forming such salts are alkaline and alkaline earth metal cations, and cations derived from ammonia and mono-, di-, and tri-alkanolamines.

In the case of preferred compound of this invention, X and Y both are CHZCHQOH, and 1 has a value of 0.

Thus the preferred compound of this invention is: 4,4'-bis{[-anilino 6 [N-(3-aminopropyl) diethanolamino]-l,3,5 triazin 2 yl]-amino}stilbene-2,2'-disulfonic acid.

The brightener compounds of this invention may be applied to substrates comprised of cellulose, polyamides, and proteinaceous fibers, and other substrates, from dilute aqueous solutions.

The compounds of this invention are generally employed in their salt form, however, the acid form may be isolated if desired.

The compounds which I have discovered are particularly advantageous not only because of the high degree of brightness which they impart to fabrics, but because the fabrics substantially maintain their bright appearance even after treatment with cationic fabric softeners. As has been mentioned before, the brighteners currently on the market are masked or quenched when the fabrics containing them are subsequently or simultaneously treated with cationic softeners.

The application of the brighteners of this invention to fabrics can be effected by conventional methods well known to the art. The fabric can be padded with the brightener during the manufacture at the mill, or in the more familar manner, the brightener may be incorporated into detergent compositions and thus be applied to the fabric during the laundry operation. Furthermore, the brighteners of this invention can be incorporated into cationic softener compositions and thus applied to the fabric at the same time the softener is applied. Generally, an aqueous solution of from about 0.05% to about 2% of brightener compound is employed.

Typical cationic softeners on the market are dialkyl dimethyl ammonium chloride solutions in which the alkyl groups generally are 12-18 carbon atoms in length. The alkyl groups in some formulations may be ethoxylated. l-methyl-l-alkylamid-ethyl-2-alkyl imidazolinium methosulfate type soft'eners are representative of other cat onic softeners also available. a v

The compounds of this invention can be combined with commercially available detergents. Typical detergent formulations comprise:

Compound: Amount by weight, percent Linear alkylbenzene sulfonate 20 Sodium tripolyphosphate 50 Sodium metasilicate Sodium sulfate 15 Carboxymethyl-cellulose 0.8 Moisture, etc. 9.2

The compounds of this invention and their starting materials can be prepared readily by conventional procedures familiar to those skilled in the art.

Thus in one manner of preparation, 2 moles of cyanuric chloride are first reacted with 1 mole of diaminostilbenedisulfonic acid and the resulting intermediate in turn is reacted with 2 moles of aniline, or metanilic or sulfanilic acid, and then with 2 moles of the appropriate amine.

The preparation can also be accomplished by the reac tion of the dichlorodianilino compound 4,4'-bis-[(6=anilino-4-chloro 1,3,5 triazin-2-yl)-amino]-stilbene-2,2- disulfonic acid with the appropriate amine.

The following examples describing certain representative embodiments of this invention will serve to further illustrate the nature of the invention. It is to be understood that the examples are merely illustrative and intended to enable those skilled in the art to practice the invention in all of the embodiments flowing therefrom and do not in anyway limit the scope of the invention defined in the claims.

EXAMPLE 1 A slurry of 150 grams of 4,4-bis-[(6-anilino 4-chloro- 1,3,5-triazin-2-yl) amino]stilbene- 2,2-disulfonic acid in 1200 ml. of water was prepared. To this slurry 71 grams of N-(3-aminopropyl)-diethanolamine are added with stirring and the mixture heated to 90 C. The pH decreased to 9.5-10 and thereafter was maintained at 10.5- 11 by the addition of 16 grams of 50% sodium hydroxide. The reaction mixture was then cooled to room temperature. The mother liquor was decanted, and 1200 ml. of water and 300 grams sodium chloride added. The solids were ground in a wet slurry with 400 ml. of 25% sodium chloride solution and acidified to pH 2 with 37% hydrochloric acid. The mixture was refiltered, washed free of mineral acid and dried in vacuo at 60 C. Yield 120 grams of a light yellow solid. The resultant product is 4,4-bis{[4-anilino 6 [N-(3-aminopropyl) diethanolamino]-l,3,5-triazin-2-yl]-amino} stilbene-2,2'-disulfonic acid.

EXAMPLE 2 After decanting mother liquors in Example 1 above, 60 grams of the semi-solid mass were dissolved in 240 ml.

of water and 150 ml. of isopropyl alcohol at C. At 45-50 C. the mixture was added dropwise to 3.5 liters of rapidly agitated concentrated isopropyl alcohol (20 25 C.). The mixture was filtered, washed with 1 liter conc. isopropyl alcohol and sucked dry. It was then dried in vacuo at 30 C. initially, then at C. Yield: 115 grams of a very light yellow powder.

EXAMPLE 3 276 grams of water and 300 grams of ice were placed in a flask and grams of cyanuric chloride and 66 grams of sulfanilic acid added. The mixture was stirred for 1 hour at 0 C. After 3 hours dropwise addition of 269 grams of 15% sodium carbonate was accomplished, bring ing the pH to 7. At the end of the addition, 1052 grams of 6.46% diaminostilbenedisulfonic acid/Na CO solution were added all at once. The mixture was heated to 70 C. and a pH 8-8.5 maintained. Thereafter the temperature was raised to -95 (3., and 400 ml. of hot water and grams sodium chloride added; followed by seeding. Then the mixture was air cooled to 45 C. and filtered.

All of the Wet filter cake is mixed with 72.2 grams N-(3-aminopropyl) diethanolamine and 75.2 grams triethanolamine and a slurry is obtained in /2 hour at room temperature. The temperature is raised to 9095 C. and the mixture agitated at this temperature for 1 hour, then cooled to 55 C., and 96.4 grams of ethyl Cellosolve added with 100 ml. water. Thereafter the mixture is filtered through a filter aid. The resultant product is 4,4'-bis{ [4- sulfoanilino-6-[N-(3 aminopropyl) diethanolamino]- 1,3,5-triazin-2-yl]-arnino}-stilbene 2,2 disulfonic acid triethanolamine salt solution.

EXAMPLE 4 The procedure of Example 1 is re eated but the N-(3- aminopropyl)-diethanolamine is replaced with N,N-dimethyl-1,3-propanediamine. The resultant product is 4,4- bis{ [4-anilino-6-[N,N dimethyl 1,3 propanediamino]- 1,3,5-triazin-2-yl]-amino}-stilbene-2,2-disulfonic acid.

EXAMPLE 5 The procedure of Example 1 is repeated but the N-(3- aminopropyl) diethanola-mine is replaced with 4 (3- aminopropyl)morpholine.- The resultant product is 4,4- bis{[4 anilino 6 [4 (3 aminopropyl)morpholino]- 1,3,5 triazin 2 yl] amino} stilbene 2,2 disulfonic acid.

EXAMPLE 6 The procedure of Example 1 is repeated but the N-(3- aminopropyl) diethanolarnine is replaced with (3.3- diamino N methyldipropylamine). The resultant product is 4,4 bis{[4 anilino 6 [(3,3' diamino N- methyldipropylamino)] 1,3,5 triazin 2 yl] amino}- stilbene-2,2'-disulfonic acid.

EXAMPLE 7 Softener formulations were made up using the brighteners of Examples 1, 4, 5, and 6. Each formulation was comprised of: 5 ml. triethanolamine, 10 ml. methyl Cellosolve, 31 ml. water, 4 gms. distearyl-dimethyl ammonium chloride, 160 mg. of a brightener compound of this invention. The pH of each formulation was adjusted to 5 with acetic acid.

(A) ZO-gram samples of unmercerized cotton fabric were washed in a Terg-O-Tometer washer with 600 ml. of water for ten minutes at F. using 1 gram of unbrightened anionic detergent. The fabric was then rinsed for 2 minutes in 600 ml. of water.

(B) Thereafter the fabrics were rinsed for 10 minutes in the Terg-O-Tometer at 100 F. with 0.6 gram of the above softener formulation in 600 ml. of water. The Lumetron and Hunter values were then determined.

The following table illustrates the degree of brightness imparted to the fabric by the compounds of this invention in the presence of cationic softeners.

TABLE 1 Softner formulation Fluorescence Hunter values with compound of (lumetron examplevalue) L a b L+3a-b 150 95. 7 l. 3 -0. 4 100. 8 151 95. 8 1. 3 -0. 3 100. 6 149 95. 7 1. 1 0. 1 98. 7 6 140 95.8 1.3 0. 2 100. 3 Cotton washed in unbrightened detergent (see A) 2O 96. 5 -0. 5 2. 1 88.7

EXAMPLE 8 Additional batches of softener formulations were made with the brightener compounds of Examples 1, 4, 5, and 6 in the same manner as Example 7; the pH was again adjusted to 5, this time with formic acid.

20-gram samples of unmercerized, prewet, unwashed cotton were then rinsed in the Terg-O-Tometer for minutes at 100 F. with 0.6 gram of softener formulation in 600 ml. of water.

Thereafter the Lumetron and Hunter values of each sample were determined and are shown in Table 2.

TABLE 2 Softener formulation Fluorescence with compound of (lumetron examplevalue) Hunter values L a b L+3ab The foregoing examples clearly demonstrate the high degree of brightness that is imparted to fabric treated with the brighteners of this invention. This high degree of brightness is very surprising when found on fabrics which have been treated with a cationic fabric softener.

While the invention has been explained by detailed description of certain specific embodiments, it is understood that various modifications and substitutions can be made in any of them within the scope of the appended 6 claims which are intended also to include equivalents of such embodiments.

What is claimed is: 1. A compound of the formula HOCHaCEIj H N A NoH2omcH-2N- NH-CH:

HOCHzCHa l I IIIH sour). 2

wherein z has a value of 0 or 1, and, (B) alkaline salts of A.

(B) alkaline salts of A.

References Cited FOREIGN PATENTS 528,445 7/1956 Canada 260--240 JOHN D. RANDOLPH, Primary Examiner U.S. Cl. X.R.

ll7-33.5; 2521l0, 117, 301.2 

